FR2747967A1 - ARTICULATION FOR MOTOR VEHICLE SEAT AND SEAT EQUIPPED WITH THIS JOINT - Google Patents

Abstract

The articulation comprises two flanges (22, 24) mounted to rotate with respect to one another, means (34, 36) for coupling the flanges to each other controlled by a member (58) mounted movably on a first flange ( 22) between the locking and unlocking positions of the articulation, and an operating member (62) connected to the control member (58). Anti-unlocking safety means comprise a finger (64) integral with the control member (58) cooperating with a slot (66) of the operating member (62) provided with two parts (66A, 66B) with contours respectively hindering and allowing movement of the finger (64) towards the unlocking position of the control member (58). The actuator is movable along a dead travel of relative displacement of the finger (64) from the first part (66A) towards the second part (66B) of the lumen, and an active travel of driving the finger (64) by cooperation with the second part (66B) of the light.

Description

The present invention relates to a joint for a vehicle seat

automobile and a seat fitted with

this joint.

  There is already known in the prior art a hinge for a motor vehicle seat, of the type comprising two substantially parallel flanges, mobile and fixed, mounted to rotate relative to each other around

  an axis of articulation which is substantially perpetual to them

  diculaire, means for coupling the flanges to each other controlled by a movable mounted member on a first

  flange between locking and unlocking positions

  rusting of the joint, and an operating member

connected to the control unit.

  A joint of this type is described by

example in EP-A-0 121 452.

  The articulation described in this document connects the backrest and the seat of the seat together so as to allow the backrest to tilt relative to the seat around an articulation axis substantially transverse to the

seat.

  An articu-

  seat lation to be able to effectively resist

  violent shocks to the vehicle.

  In particular, in the case of a vehicle rear seat, the backrest can be used to separate the

  luggage compartment of the vehicle in the passenger compartment of this vehicle

  the. The articulation connecting the backrest to the seat must therefore be able to withstand the significant efforts transmitted by the

luggage in the event of an impact.

  For this purpose, it has been envisaged, on the one hand, to reinforce the various parts of a joint in order to increase its solidity, and on the other hand, to prevent any risk of reversibility of the joint which could cause a accidental unlocking of the latter

in the event of a violent shock.

  The object of the invention is to propose a joint

  irreversibly lockable action, particularly in the event of a violent shock to this joint.

  To this end, the subject of the invention is an articu-

  lation for a seat of a motor vehicle, of the aforementioned type, characterized in that it comprises anti-unlocking security means comprising a finger secured to the control member cooperating with a light, provided in the operating member, provided with first and second

  parts delimited respectively by contours between

  front and allowing movement of the finger towards the unlocking position of the control member, the operating member being movably mounted on the first flange

  following a journey comprising a dead travel movement

  relative finger from the first part to the

  second part of the light, and an active run of

  finger dragging by cooperation with the second party

of light forming a guide.

  According to other characteristics of this articulation: - the control member is mounted floating on the first flange while being movable according to a combined movement in translation and in rotation; - the first flange is the mobile flange; - the operating member is resiliently returned to the locking position of the control member; the operating member forms an operating lever articulated on the first flange around an axis substantially perpendicular to the flanges; - The light is formed in a first arm of the operating lever and has a general L-shape, the two parts of the light respectively forming two branches substantially perpendicular to each other of the L, the second part of the light extending substantially radially towards the axis of articulation of the operating lever, and a second arm of the operating lever is connected to the first flange by a return spring urging this lever towards the locking position of the control member; - The operating member is connected to an operating handle by cable means; the coupling means comprise complementary mobile and fixed toothing carried respectively by

mobile and fixed flanges.

  The subject of the invention is also a seat for a motor vehicle provided with a joint as defined above, characterized in that the joint connects a backrest to a seat of this seat so as to

  allow the file to be tilted in relation to the

  se, the axis of the articulation being substantially transverse

at headquarters.

  According to another characteristic of this seat, the latter forms a rear seat of the vehicle, the back of this seat separating a boot of the vehicle from the passenger compartment.

this vehicle.

  The invention will be better understood on reading the

  description which will follow given only as a

  example and made with reference to the accompanying drawings in which: - Figure 1 is a perspective view of a pair of rear seats, according to the invention, arranged in a motor vehicle; - Figure 2 is an elevational view of a hinge according to the invention connecting the backrest to the seat of one or other of the seats shown in Figure 1; - Figure 3 is an exploded perspective view of the joint shown in Figure 2; - Figures 4 to 6 are partial views of the joint shown in Figure 2 in different

  operating configuration of this joint.

  FIG. 1 shows a pair of similar rear seats 10, according to the invention, arranged

  in the passenger compartment 12 of a motor vehicle.

  In what follows, we will only refer to a

only of the seats 10 in FIG. 1.

  The seat 10 includes a backrest 14 connected to a

  seat 16 by at least one articulation 18 according to the invention

  tion. The file 14 separates a trunk 20 from the vehicle of

the passenger compartment 12.

  The articulation 18, which is illustrated in more detail in FIGS. 2 to 6, allows the backrest to be tilted

  14 relative to the seat 16 around an axis of articulation

  tion X substantially transverse to seat 10.

  With particular reference to FIGS. 2 and 3, it can be seen that the articulation 18 comprises two flanges 22, 24, substantially parallel, one, mobile, being fixed on the

  backrest 14, and the other, fixed, being fixed on the seat 16.

  The flanges 22, 24 are mounted to rotate relative to each other around the axis of articulation X which

  is substantially perpendicular to them.

  The movable flange 22 has two parts fixed to one another in a manner known per se, forming one, a plate 26 of generally circular shape, and the other, a plate 28 for connection with a conventional frame of the

file 14.

  The fixed flange 24 has a first end forming a plate 30 and a second connection end 32

  with a classic seat frame 16.

  The axis of articulation X is materialized by a

  pin A connecting the two mobile 26 and fixed 30 plates.

  The articulation 18 comprises coupling means

  flanges between them including complementary teeth

  mobile 34 and fixed 36 shields carried respectively by the

mobile 22 and fixed 24 flanges.

  The fixed toothing 36 is formed on the inner contour of a fitting 38, in the general shape of an arc, fixed on the fixed plate 30 by means, for example, of rivets.

, 42 and nipples 44.

  The movable toothing 34 is formed on a slide 46, forming a grain, mounted movable substantially in translation on the movable plate 26 between a joint locking position, in which it is taken with the fixed toothing, as shown in the Figures 2, 4 and 5, and a position for unlocking the joint, in which it is spaced approximately radially from this fixed toothing 36, as is

shown in figure 6.

  The fixed toothing 36 extends along a larger angular sector than the movable toothing 34, so as to allow the establishment of several positions for adjusting the inclination of the backrest 14 relative to

the seat 16.

  The grain 46 is moved by means of an operating cam 48, in the general form of a boot, floatingly mounted on the movable plate 26 while being displaceable according to a

  combined movement in translation and rotation.

  The movement of the operating cam 48 is transmitted to the moving grain 46 by partial fitting of a substantially circular end 48C of the cam with a

  notch 46E of the grain, of general complementary shape.

  The grain 46 and the control cam 48 are housed in a recess 50 of the movable plate 26 delimited by a contour 52 for guiding the grain and the control cam. The housing delimited by the depression 50 extends inside the joint, between the two

fixed and mobile plates.

  A stud 54, integral with the grain 46, mounted slidingly

  health in a buttonhole 56 formed in the plate

  mobile 26, also participates in guiding this grain 46.

  It will be noted that the combined movement in translation and in rotation of the control cam 48 is imposed by the fact that the outline of this cam rests, on the one hand, on the guide outline 52 of the movable plate, and

  on the other hand, on the notch 46E of the grain.

  The operation of the floating control cam 48 is described, for example, in EP-A-0 121 452 and FR-A-95

  425 to which we can refer for more details

  tails. The movement of the control cam 48 is returned to the outside of the articulation by means of a return lever 58 coupled with this cam 48 by a pin 60 of

substantially square section.

  The return lever 58 therefore forms a control member mounted floating on the movable plate 26 while being displaceable according to a combined movement in translation and

in rotation.

  The return lever 58 is movable between

  locking and unlocking positions of the

  culation 18, together with the control cam 48, at

  means of an operating member forming a lever 62.

  This operating lever 62 is articulated on the

  movable plate 26 around an axis substantially perpendicular to

  laire aux flasques 22,24, coinciding for example with

the X axis of the joint.

  The articulation 18 according to the invention comprises anti-unlocking security means comprising a finger 64, integral with a free end of the return lever 58, cooperating with a light 66 formed in a first

arm 62A of the operating lever 62.

  The light 66 has a general shape in L and is provided with two parts 66A, 66B respectively forming two branches substantially perpendicular to each other of the L. The first part 66A is delimited by a

  contour hindering the movement of finger 64 towards the posi-

  release of the articulation of the return lever 58. The second part 66B is delimited by an outline allowing movement of the finger 64 towards the unlocking position of the articulation of the lever

reference 58.

  Note that the second part 66B of the light extends substantially radially towards the axis of articulation

X of the operating lever 62.

  The operating lever 62 can pivot around the axis X along a path comprising a dead stroke of relative movement of the finger 64 from the first part 66A of the light to the second part 66B of this light, followed by an active stroke d training

  finger 64 to the unlock position of the joint-

  tion by cooperation with the second part 66B of the

light forming guide.

  It will be noted that during the dead stroke of the operating lever 62, the finger 64 is stationary relative to the

mobile stage 26.

  Note also that the dead stroke of the lever

  maneuver 62 allows play and clearance to be taken into account

  manufacturing rancid elements of the joint 18,

  in particular the control cam 48.

  The second arm 62B of the operating lever 62 is connected to the movable flange 22 by a return spring 68 resiliently urging this operating lever 62 towards

  the locking position of the return lever 58.

  Preferably, the operating lever 62 is actuated by means of an operating handle 70, carried by the backrest 14. Conventional cable means 72

  connect the operating lever 62 to the handle 70.

  The operation of the articulation 18 according to the invention will be described below with reference to

Figures 4 to 6.

  Initially, the operating levers 62 and

  reference 58 are in the articulation locking position.

  tion, as shown in Figure 4. The finger 64 is housed in the first part 66A of the light. The

  grain 46 is engaged with the fixed toothing 36.

  In the event of a violent shock exerted on the articulation 18 which tends to move the grain away from the fixed toothing, the finger 64 tends to move towards the position for unlocking the articulation under the effect

  of the movement transmitted to it by grain 46 through

diary of the control cam 48.

  However, the movement of finger 64 toward the posi-

  release is hampered by the outline of the

  first part 66A of light.

  It will be noted that the contour of the first part 66A of the light has a ramp R inclined relative to the axis of articulation of the operating lever 62 so as to immobilize the finger 64 in this first part 66A all the more firmly as the effort exerted by the finger

64 on this ramp is important.

  Thus, the joint 18 remains in the locked position even when it is subjected to significant forces. To unlock the articulation 18, the operating handle 70 is actuated, which has the effect, by means of the cable means 72, of turning the operating lever 62 upwards, in the direction

  of the arrow illustrated in FIGS. 5 and 6.

  The operating lever 26 then travels in a circular dead stroke causing the relative movement of the finger 64 from the first part 66A of the light to the second part 66B of this light, like this

is shown in Figure 5.

  The dead stroke is followed by a circular active stroke of the operating lever 62 during which the finger 64 cooperates with the second part 66B of the light, by ramp effect, so as to cause the

  return lever 58 and the toothed grain 46 towards their posi-

  release, as shown in the

figure 6.

  When the operating handle 70 is released, the operating lever 62, the return lever 58 and the toothed grain 46 are resiliently returned to the positions represented in FIG. 4 by the spring of

reminder 68.

  Note that the control lever 58 is returned to its locking position by cooperation of the outline of the first part 66A of the light with the

finger 64.

  The invention is not limited to the embodiment

tion illustrated in the figures.

  In particular, the light of the anti-unlocking security means can be provided in an operating member that can be moved in translation and not in rotation.

  like the operating lever 62 previously described.

  Furthermore, the control lever is not necessarily mounted floating on one of the flanges but can also be articulated around a fixed axis on this flange. he

Claims (10)

  1. Joint for a motor vehicle seat, of the type comprising two substantially parallel, movable (22) and fixed (24) flanges, mounted to rotate relative to one another about an axis of articulation (X) which their is   substantially perpendicular, means (34,36) for   range of the flanges (22,24) controlled by a member (58) movable mounted on a first flange (22) between the locking and unlocking positions of the joint, and an operating member (62) connected to the control member (58), characterized in that it comprises anti-unlocking security means comprising a finger (64) integral with the control member   (58) cooperating with a light (66), formed in the or-   operating shaft (62), provided with first (66A) and second (66B) parts delimited respectively by contours hampering and allowing movement of the finger (64) towards the unlocking position of the control member (58), l maneuver being mounted movable on the first flange (22) along a path comprising a dead stroke of relative movement of the finger (64) from the first part (66A) to the second part (66B) of the light, and a race active finger training (64) by cooperation with the second part (66B) of the light forming guide.   2. Joint according to claim 1, character-   in that the control member (58) is mounted floating on the first flange (22) while being movable   following a combined movement in translation and in rotation tion.   3. Joint according to claim 1 or 2, characterized in that the first flange is the flange mobile (22).   4. Articulation according to any one of   previous claims, characterized in that the or-   operating handle (62) is resiliently biased towards the   locking position of the control member (58).   5. Articulation according to any one of   previous claims, characterized in that the or-   operating handle (62) forms an operating lever articulated on the first flange (22) about an axis   substantially perpendicular to the flanges (22,24).   6. Joint according to claims 4 and 5   taken together, characterized in that the light (66) is formed in a first arm (62A) of the operating lever and has a general L-shape, the two parts (66A, 66B) of the light respectively forming two substantially perpendicular branches between them L,   the second part (66B) of the light extending sensitive-   radially towards the articulation axis (X) of the operating lever (62), and in that a second arm (62B) of the operating lever is connected to the first flange (22) by a return spring (68 ) requesting this lever (62) towards   the locking position of the control member (58).   7. Articulation according to any one of   previous claims, characterized in that the or-   operating handle (62) is connected to an operating handle   glass (70) by cable means (72).   8. Articulation according to any one of   previous claims, characterized in that the   coupling means include complementary teeth   mobile (34) and fixed (36) res carried respectively by   the movable (22) and fixed (24) flanges.   9. Motor vehicle seat with   articulation (18) according to any one of the claims   tions above, characterized in that the articulation (18) connects a backrest (14) to a seat (16) of this seat so as to allow the backrest to tilt relative to the seat, the axis (X) of the joint being substantially transverse to the seat.   10. Seat according to claim 9, characterized in that it forms a rear seat of the vehicle, the backrest (14) of this seat separating a trunk (20) of the vehicle from the passenger compartment (12) of this vehicle.